Use the interactive map below to check population changes. Zoom in to see where Podocnemis unilfilis is Endangered based on IUCN Redlist criteria - A3bd.
This is an extension of Norris et. al. 2019 that includes:
- Stochastic population projections.
- Future impacts to populations caused by human acessibility (hunting and habitat change) and actions that reduce river connectivity.
Map
Due to the number of points, the map can become slow to respond when you zoom in. Zoom out to a level showing fewer points and you can pan around the map to find the area of interest. Then zoom in again to check the coloured points.
Free-flowing rivers
When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.
River points Norris et. al. 2019
Map below uses the river points from Norris et. al. 2019.
When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.
Tables
A summary of the results is presented below. Summaries by country and major basin.
Summary by country.
| Country | Accessible | Endangered (prop) | river length (km) | length End. | length not End. | Free Flowing (prop) | length ff | length not ff |
|---|---|---|---|---|---|---|---|---|
| Bolivia | no | 0 | 1641 | 0 | 1641 | 1.00 | 1641 | 0 |
| Bolivia | yes | 1 | 17098 | 17098 | 0 | 0.98 | 16735 | 363 |
| Brazil | no | 0 | 30758 | 0 | 30758 | 0.98 | 30253 | 505 |
| Brazil | yes | 1 | 92740 | 92740 | 0 | 0.93 | 86027 | 6713 |
| Colombia | no | 0 | 6771 | 0 | 6771 | 1.00 | 6771 | 0 |
| Colombia | yes | 1 | 11266 | 11266 | 0 | 0.98 | 11045 | 221 |
| Ecuador | no | 0 | 154 | 0 | 154 | 1.00 | 154 | 0 |
| Ecuador | yes | 1 | 3176 | 3176 | 0 | 1.00 | 3169 | 7 |
| French Guiana | no | 0 | 443 | 0 | 443 | 1.00 | 443 | 0 |
| French Guiana | yes | 1 | 1390 | 1390 | 0 | 0.89 | 1239 | 151 |
| Guyana | no | 0 | 1403 | 0 | 1403 | 1.00 | 1403 | 0 |
| Guyana | yes | 1 | 3272 | 3272 | 0 | 1.00 | 3272 | 0 |
| Peru | no | 0 | 2143 | 0 | 2143 | 1.00 | 2143 | 0 |
| Peru | yes | 1 | 21304 | 21304 | 0 | 1.00 | 21266 | 38 |
| Suriname | no | 0 | 1805 | 0 | 1805 | 1.00 | 1805 | 0 |
| Suriname | yes | 1 | 2103 | 2103 | 0 | 0.89 | 1869 | 234 |
| Venezuela | no | 0 | 5759 | 0 | 5759 | 0.97 | 5604 | 155 |
| Venezuela | yes | 1 | 12623 | 12623 | 0 | 0.78 | 9889 | 2734 |
| Total | 215849 | 164972 | 50877 | 204728 | 11121 |
Summary by basin.
Using results from updated Norris et. al. 2019.
| Basin | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|
| Amazon | 0.77 | 170905 | 131958 | 38947 |
| Coastal North | 0.68 | 12700 | 8626 | 4074 |
| Coastal South | 1.00 | 5711 | 5711 | 0 |
| Orinoco | 0.70 | 26533 | 18677 | 7856 |
Same using Free-flowing rivers data.
| Basin | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|
| Amazon | 0.72 | 280121 | 202508 | 77613 |
| Coastal North | 0.52 | 20835 | 10879 | 9956 |
| Coastal South | 1.00 | 6467 | 6467 | 0 |
| Orinoco | 0.64 | 46014 | 29533 | 16481 |
Summary by major basins and countries.
| Basin | Country | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|---|
| Amazon | Bolivia | 0.91 | 18739 | 17098 | 1641 |
| Amazon | Brazil | 0.74 | 116106 | 85750 | 30356 |
| Amazon | Colombia | 0.54 | 7769 | 4229 | 3540 |
| Amazon | Ecuador | 0.95 | 3330 | 3176 | 154 |
| Amazon | Guyana | 1.00 | 299 | 299 | 0 |
| Amazon | Peru | 0.91 | 23447 | 21304 | 2143 |
| Amazon | Venezuela | 0.08 | 1215 | 102 | 1113 |
| Coastal North | Brazil | 0.76 | 1681 | 1279 | 402 |
| Coastal North | French Guiana | 0.76 | 1833 | 1390 | 443 |
| Coastal North | Guyana | 0.68 | 4376 | 2973 | 1403 |
| Coastal North | Suriname | 0.54 | 3908 | 2103 | 1805 |
| Coastal North | Venezuela | 0.98 | 902 | 881 | 21 |
| Coastal South | Brazil | 1.00 | 5711 | 5711 | 0 |
| Orinoco | Colombia | 0.69 | 10268 | 7037 | 3231 |
| Orinoco | Venezuela | 0.72 | 16265 | 11640 | 4625 |
Same with Free-flowing rivers…..
| Basin | Country | Endangered (prop) | river length (km) | length End. | length not End. |
|---|---|---|---|---|---|
| Amazon | Bolivia | 0.70 | 22217 | 15516 | 6701 |
| Amazon | Brazil | 0.73 | 180434 | 132296 | 48138 |
| Amazon | Colombia | 0.53 | 18687 | 9874 | 8813 |
| Amazon | Ecuador | 0.85 | 8302 | 7066 | 1236 |
| Amazon | Guyana | 1.00 | 423 | 423 | 0 |
| Amazon | Peru | 0.78 | 47363 | 36750 | 10613 |
| Amazon | Venezuela | 0.22 | 2695 | 583 | 2112 |
| Coastal North | Brazil | 0.66 | 3653 | 2421 | 1232 |
| Coastal North | French Guiana | 0.63 | 3297 | 2081 | 1216 |
| Coastal North | Guyana | 0.41 | 6928 | 2867 | 4061 |
| Coastal North | Suriname | 0.46 | 5756 | 2643 | 3113 |
| Coastal North | Venezuela | 0.72 | 1201 | 867 | 334 |
| Coastal South | Brazil | 1.00 | 6466 | 6466 | 0 |
| Coastal South | French Guiana | 1.00 | 1 | 1 | 0 |
| Orinoco | Brazil | 0.00 | 2 | 0 | 2 |
| Orinoco | Colombia | 0.72 | 19865 | 14248 | 5617 |
| Orinoco | Guyana | 1.00 | 21 | 21 | 0 |
| Orinoco | Venezuela | 0.58 | 26126 | 15264 | 10862 |
Next steps
- Update using points from Free Flowing Rivers
https://www.worldwildlife.org/pages/free-flowing-rivers